DIFF Subgroup
G02B 5/20 Filters (polarising elements G02B5/30)
Introduced: September 1968
Title
Titles differ between systems:
IPC: Filters
CPC: Filters (polarising elements G02B5/30)
Full Title
Full titles differ between systems:
IPC:
Optical elements other than lenses > Filters
CPC:
Optical elements other than lenses (light guides G02B6/00; optical logic elements G02F3/00) > Filters (polarising elements G02B5/30)
CPC subdivides this area 4x more granularly than IPC with 8 additional codes.
8 codes are CPC-only extensions.
1 shared codes have differing titles between IPC and CPC.
Child Classifications
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